From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Fri, 20 Jun 2014 17:58:28 +0000 (-0700)
Subject: staging: comedi: introduce comedi_buf_n_bytes_ready()
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~166^2~1552
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f4f3f7cf27e7ae015672b59ec40c7deabeaf5d2e;p=pandora-kernel.git

staging: comedi: introduce comedi_buf_n_bytes_ready()

Introduce an inline helper to return the number of bytes that are
ready to read from the comedi_async buffer. Use the helper in the
comedi drivers that currently do the calculation as part of the
(*poll) operation.

Also, use the helper in comedi_fops where the calculation is used as
part of the subdevice going nonbusy.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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